Differential-pressure gage.



"To all wio'm tgm ay concern. l

i an

orrore.

WILLIAM GLYBE BAXTER,l OF BARTLESVILLE, OKLAHOMA; ROBERT D. WADDILL AIPMNISTILATOR 0E SAID WILLIAM GLYDE BAXTER, DECEASED.

DIFFERENTIAL-PRSSURE GAGE.

ignacio.

Specication of Letters Iatcxit.

Patented Jan. 2S, 19M?.

Application ledTfelzruaryl/, 1916, Serial No. 73,263. Renewed Auguat, i918, Serial No. 250,754.

lle it known. that LV'WILLIAM 'rmaI` residing at ,lartcsvillm in the county or Washington and State of Oklahoma, a citi-r zen of .the United States, have invented 0r discovered certain new and useiullmprovements in Dilfei'ental-Pressure Gages, of

'which,irnprovemcntsthe following is a speer .y

lical ion'.

The` invention described herein relates 'toccrtain improvements in diiierential pressure gages adapted tomeasure slight variations between two high fluid pressures and or thc class or hind in which the recording f mechanism is actuated by a floatearried by .As these gages iiavebeen heretofore con structed. an excessive. pressure on one of the columns of liquid would displace the liquid from bot'i eolumnsand render the gage inoperative until the-liquid had .been renewed.

The object of the inilirovement hereinaftermore fully dcscribcd and claimed, isto provide for the cscapc.; ,-l.-hiid pressure trom the chamber ha ving ,l he h ighcr, pressure, without dcstroying.,Y thc scalhctwecir thetwo cham' bers, and oriho automatic restoration oi, operative conditions .when pressure luis droppedbolo,v a predetermined maximum.

ln ihc accompanying drawing.,r forming a part of this specification, Figure 1 is a view iartlv in section and iai'tlv :in elevation showing; my improvement applied to a dit'- fcrential pressure gag'c; Fig. 2 is a view simi lar .to Fig. 1, of' -a different form of gage havingr the,improvementapplied thereto. p

The gage shou'irin,Figi lconsisls of an outer .shell 1 provided with an inlet .port i2, and an inner shell whaving an external diameter substantially less than the internal diameter of tho oulcr shell. and provided at its uppcr ond with a flange l adapted 1.o bc secured to thu upper cud olf' lhc shell l. aud

close rthc annular chamber forli-ind bc,-4

which isprclcrably formed by making the inner shcll ol such a length relative to the'A depth o'l' thc shell '1 thatn'a small space is 'formed intermediate the shells.

The chambers A and Bare charged with a suitable liquid as for example, mercury to '13, having- ,ils discharge end above 1 not' liquid in chamber l, at such maximum pressure of the fluid entering chamber A through port exceeds that of the fluid in chamber B, liquid will .be forced 'from the chainber A through passages G and 5 into chamber B, therebyv raising the float. 7, which is flexibly connected to' one end of the arm 8. secured to the shaft l). This shaft. which is mounted in suitable bearingsl in the sides of the cap` pieces 10, has its outer end oper.- ativcly counectodto a member of an indicating mechanism, as the pen arm 11.

As thcpressurc. increases in (.fhamber A, the liquid therein will be depressed until the pressure` has attained a predetermined'maximum'. Vlhen this pressure has been at tallied, the level of the fluid will have passed below a port 32 leadingr to a vertical passage 1c level pressure. As soon as this port is uncovered thc fluid will escapev Yfrom chamber A forcing;A through the passage "in the small quantity of the liquidl contained therein. As soon as pressure in chamber A has dropped below the maximum, the liquid will flow back frn'i -chambcr l iul'o chamber lr and the escape port will he submerged, andthe operation of the gage become normal. As the escape port is above thc pass-agro (i. thc seal formed by lthe liquid in the lat-tor will not. be broken and thc level ol' thc liquid in thc chauiiber B will remain at a heigrhl. corresponding to the liredetcrmined maximun'i pressure in the chamber A at thc time the escape port. was opened.

yIn order lo prevent any loss of the liquid employed in the page, a dcllectinp; plate 1l is a 'ranged above lhc discharge end of the escapo passage lil. and preferably a baille plato 15 is arrnng'cd bcion' and in liuc with the outlet 1li irom thc cap picco. Any liquid driven oul 'of the passage 13 will flow hack into thc chamber ll thcreby increasing lhc height of liquid in chambcr ll from which it will limi' bacli iulo '.qhambcr aud as thc prcssuri.' has'becn reduced in thc lail'cr the escape port 12 will he covered until thc pressure in chamber A. again exceeds the maximum. c r

y ln the construction shown" in Figv 2., the shells 1 and 3'* have their lower ends-com nei-ted by. a iassage 17 whereby the liquid can How freely back and forth between the chambers according to the relative pressures lio therein. The fioat 7 is carried by an arm 8 secured on the shaft 9, to which is also attached the pen arnrll of the recording mechanism.

.A tube 18 extends from a point above the connection of the passage 17 of' chamber A, to a point in chamber B above the level of' the liquid in the latter. The positlon of the lower or inlet end of this tube 18 will depend upon the desired maximum difference of pressure in the chamber, but in all cases the inlet to the tube should be above the point where the passage 17 connects with the chamber A, so that pressure may be relieved before the seal formed by .liquid in passage 17 is broken.

I claim herein asmy invention:

1. In a. differential pressure gage, the combination of two connected liquid containing-chambers, a float arranged in one of said chambers, recording mechanism operative by the float and means permitting the escape of fluid from the high pressure chamber without forcing the liquid from. the normal' connection between the chambers.

2. In a differential pressure gage, the combination of two connected liquid chambers, a floatarranged in one of said charnbers, recording mechanism operative by-th float, means permittingof the escape of liuid from the high vpressure chamber without forcing the liquid from the normal connections between the chambers and means for returning to the float chamber'liquid forced from the high pressure chamber.

3. In a differential pressure gag'fe,l the v combination of two liquid containing chambers, a connection between the lower portions of said chambers, recording mechanism operative by the float, and a connec# tion extendingfrom a point below the normal level of' the liquid in the high pressure chamber and 'adapted to deliver liquid to the float chamber at a level of the liquid therein.

4.. In a differential combination oft-woiiquid containing chambers, a connection between the lower portions of' said chambers, an outlet fromthe high pressure chan'lber arranged, intermediate the level of the liquid in the high pressure-chamber at minimum pressure and the point of connection with the low pressure chamber, a float arranged in the low pressure chamber, and recording uwclxanism operative by the float.

In a differential pressure gage thc combination of an outer shell, a removable inner shell having an external diameter less point above nular space between the pressure gage, the

than the internal diameter of. the outer shell, a passageway formed between the lower portions of the shells to permit the flow of' liquid from the annular space between 'the shells into the inner shell, flanges on the inner shell extending over the anshells and supported by the outer shell, a cap or cover for the inner shell, a float arranged inthe inA ner shell, an indicator and connecting means extending from the float through the cap to the indicator.

6. In a differential pressure gage the combination of an outer shell, a removable inner shell having an vexternal diameter less than the internal diameter of the outer shell, so arranged ,within the outer shell as to form an annular chamber exterior to the .chamber formed by the inner shell, a passageway between the lower portions of the chambers formed by said shells to permit the flow of liquid from .the outer to the inner chamber, and supported by the outer shell, a passageway extending from the lower portion of the chamber formed by the outer shell to a point above the normal level of' liquid in the inner shell, a cap or cover extending over the inner shell, a float arranged in the inner shell, an indicator and connecting means. extending from the float through the cover tol the indicator.

7. In a differential pressure gage the combination of an outer shell, a removable inner shell having an external diameter less than the internal diameter of' the outer shell, so arranged within the outer shell as to form an annular chamber exterior to the .chanlber formed by the inner shell, a connecting' passage between the lower portions of' the chambers formed by` lsaid shells to permit of' the liow of liquid from the outerv to the inner chamber, flanges on the inner shell extending Vover the outer chamber and supported by the outershell, a passageway extending from the lower portion of' thechamber formed by the outer shell to a point above the normal levelof' liquid in the inner shell, said passage having a port above the lower end of `the inner shell for the escapo of' gas irm the outer shell, a-coverextending over the. ,inner shell, a float arranged in the inner sncll, an indicator andromiech ing means extending from the fioat through the cover to the. indicatoxx In testimony whereof, I have hereunto set my hand.

WILLIAM lVitncsses l JAs. l. Fisnnu, ERNEST l). IluKs'rruN.

(L YDE BA 4XTICR. l

.t Correction in Letters Patent No. 1,292,418.'

`It is. hereby certified that Letters Petent'No. 1,292,418, lgranted. January 28, 1919,'upon the applioatio'ioilwilliem Clydelaxter, of BevtleevillefOklehoipeV 'for en' improvement in Difierentiel-Pressure Gages, were erroneously iseed to Robert D. Waddill, adminietreto of, said' William Clyde Baxter, (leceased, Whereas said Letters Patent should lm'vfe beenissued to' Hope Baztefl', a/n'ntstmtrta: of'eafid William Clyde Bategf, deceased, es shown byzthejeoordko aesig'ii/lents inI this office;

and that the seid 'Lettere Potent shouldbe read with this con'eet'il thei'ein that the seme may oqnfoim to the 'record-of the oeste'` in the 4-Petent Oice. r Signed and sealed this 25th deyfof February, A. 15.114919, l l

` i F. W.V H. CLAY, D

[SEAL] e nimo Commissioner of Patents. I 

